alluvion

/əˈluːviən/
noun
  1. The gradual accumulation of soil or sediment along a riverbank or shoreline, often resulting in new land.
    • Over decades, alluvion added several acres to the coastal village.
    • The farmer claimed ownership of the alluvion that formed along his riverfront property.
    • Legal disputes sometimes arise over alluvion when river boundaries shift.
Synonyms
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